Revert "Use native async/await support in pub."

tools/testing/dart/test_configurations.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library test_configurations;
 
 import "dart:async";
 import 'dart:io';
 import "dart:math" as math;
 
@@ skipping 181 matching lines @@
             print("Running the 'pkgbuild' test suite requires "
                   "passing the '--use-sdk' to test.py");
             exit(1);
           }
           testSuites.add(
               new PkgBuildTestSuite(conf, 'pkgbuild', 'pkg/pkgbuild.status'));
         } else if (key == 'pub') {
           // TODO(rnystrom): Move pub back into TEST_SUITE_DIRECTORIES once
           // #104 is fixed.
           testSuites.add(new StandardTestSuite(conf, 'pub',
-              new Path('sdk/lib/_internal/pub'),
+              new Path('sdk/lib/_internal/pub_generated'),
               ['sdk/lib/_internal/pub/pub.status'],
               isTestFilePredicate: (file) => file.endsWith('_test.dart'),
               recursive: true));
         }
       }
 
       for (final testSuiteDir in TEST_SUITE_DIRECTORIES) {
         final name = testSuiteDir.filename;
         if (selectors.containsKey(name)) {
           testSuites.add(
@@ skipping 75 matching lines @@
                      recordingOutputPath);
   }
 
   // Start all the HTTP servers required before starting the process queue.
   if (serverFutures.isEmpty) {
     startProcessQueue();
   } else {
     Future.wait(serverFutures).then((_) => startProcessQueue());
   }
 }